Right, with this and chloroquine, assuming it works to prevent the virus from binding to ACE2, you'd want it to be in the early stages, before massive damage to the lungs, liver, intestines and brains are done (all of these are targeted by this virus). All other countries that are testing these are giving the drugs to patients in both the early and late stage of the infection. In the US alone, trials are only being done in the very late stage, after permanent damage has been done, and it's less likely to be of much use.